Antistalling device



March w, i935. L.. E.. l= ERx=en\xe: 2,033,396

ANTISTALLING DEVICE Filed Aug. l2, 1929 k 31a/vento@ Patented Mar. l0, 1936 UNITED STATES PATENT oFFlcE ANTISTALLIN G DEVICE Ware Application August 12, 1929, Serial No. 385,227-

15 Claims.

In automotive vehicles in which there are provided internal combustion propelling engines, there is commonly provided a device which is known as an accelerator through which, by moving the throttle valve of the carburetor, the operator of the vehicle may controlthe speed of Athe engine, Movement of the accelerator in a direction to open the throttle valve and increase the speed of the engine is ordinarily eiected by movement of the operators foot, whereas movement of the accelerator-in the reverse direction to close the throttle valve and decrease the speed of the engine is ordinarily effected automatically by means of a suitable spring device which causes the throttle valve to be moved from open to closed position quite suddenly.

When the engine is .operating at high speeds or under heavy loads and under such conditions that no extraneous means will function to prevent a sudden decrease in the speed of the engine, a sudden movement of the throttle valve from open to closed position causes a sudden decrease inthe speed of the engine. This sudden decrease in the speed of the engine disturbs mixture con- -ditions in the induction system and, ordinarily, results in uneven running of and,l frequently, in stalling the engine.

' My invention relates to means for preventing a sudden decrease in the speed of the engine so as to prevent uneven running or stalling of the engine under the conditions outlined above, `and resides, in the embodiment of 'my invention illustrated in the accompanying drawing, in the pro- Vision of a dashpot, anda piston which works in the dashpot and is adapted to be engaged, through the intermediary of a piston rod, by the throttle valve operating arm when the throttle valve reaches a predetermined position, and, thereafter, to decelerate the rate of closing of the throttle valve so that suiiicient time will elapse before the throttle valve reaches y. fully closed position for mixture conditions in the induction system to become adjusted to the slower rate of engine speed and that uneven running and stalling of the engine is prevented.

For a better understanding of the nature an objects o-f the present invention, reference is made to the following specification-in which is described the preferred embodiment of my invention which is illustrated in the accompanying drawing.`

In the single figure of the accompanying drawing, there is shown, in side elevation with parts broken away and in section, a carburetor and certain associated parts of an automotive vehicle in'which is embodied my invention.

In the drawing, the reference character 4 indicates the riser of the intake manifold of an internal combustion engine, and the reference character 5 a carburetor, which includes a mixing chamber Ii, a float bowl 'I to which fuel is supplied from a suitable source through a pipe 8, and a mixture conduit 9 which opens into the mixing chamber 6 and into the intake riser d. In the mixture conduit 9, there is located a throttle valve I0 of the buttery type which is fixed on a shaft II. y

To the body of the carburetor, there is suitably secured al dashpot I 2, which is connected -15 to the float bowl by a' conduit I3 which opens into the oat bowl and the dash pot below the level of the fuel in the oat bowl, so that when the float bowl is lled, fuel will flow therefrom, through the conduit I3, into the dashpot and ll the latter lto the same level as the oat bowl. The upper end of the dashpot is closed by a suitable cover I4, which may be, as shown in the drawing, integral with the body of the carburetor eand the means through which the dashpot is secured to the body of the carburetor. AA piston I rod I5 is slidably mounted -in a guide I6 which extends through 'the cover It of the dashpot. The upper end of the piston rod extends abovel the upper end of the guide I6 and the lower end 30 there-of extends into the dashpot and carries a piston II through which extend a plurality of openings I 8. A plate valve I9, which is slidaloly mounted on a projection 20 which is formed on the lower side of the piston, is urged, by a coil spring 2l which surrounds the projection and bears at its opposite ends against the lower side of the valve I9 and against an abutment 22 which is xed onthe projection 20, to a position in which it closes the openings I9. A coil spring 23, .40 which bears at its opposite ends against the abutment 22 and against the bottom of the dashpot, urges the piston I'I to its uppermost position in the dashpot. f

To the shaft II on which the throttle valve is mounted, there is secured' an operating arm 24 through an intermediate portion of which extends a set screw 25, which is adapted to engage the body of the carburetor to limit the closing movement of the throttle valve, and on which is provided an extension through which extends a set screw 26 which is adapted to abut against the upper end of the piston rod I5. There is secured to the operating arm 24, intermediate its) ends, a rod 21 through which the throttle valve 5'5 i is adapted to be opened by an accelerator of the type which is ordinarily provided on automotive vehicles and through which the Athrottle valve is adapted to be closed by a suitable spring device (not shown) of the type which is ordinarily employed on automotive vehicles and which is strong enough to close the throttle valve against the resistance of the spring 23.

When the carburetor is installed on the internal combustion enginev of an automotive vehicle and the engine is operating at a speed above a predetermined speed, the set screw 26 will not be in engagement with the piston rod i5. When, however, the operator of the vehicle moves the accelerator, or allows it to be moved, in a direction to decrease the speed of the engine, the rod 21 will move thethrottle valve toward closed position. When the throttle valve has been ,closed to a predetermined extent, the set screw 26 will abut against the upper end of the piston rod I5.

Thereafter, further movement of the rod 2l in a direction to close the throttle valve Will cause the piston to be moved downwardly in the dashpot. Since downward movement of the piston will be resisted by the spring Z3- and can take place only when accompanied by leakage of fuel from the lower to the upper side of the piston, the movement of the throttle valve from the position in which it is when the set screw 26 abuts tioned insures that, before the throttle valve. has reached fully closed position, sumcient time will have elapsed for the mixture conditions in the induction system to become adjusted to the slower rate of engine speed and, therefore, serves to prevent uneven running and stalling of the engine at such times.

When the rod 27 is operated to move the throttle from closed to open position, the piston il will be moved upwardly in the dashpot by the spring 23. During this upward movement, the valve I9 will be opened against the resistance of the spring 2| and sufcient of the fuel in the dashpot above .the piston will drainthrough the openings 'I8 into the portion of the Idashpot below the piston to maintain the lower part of the dashpot filled with fuel, I

It is obvious that the objects of the 'invention may be attained by means other than described above. For this reason, it is to be understood that, although I have shown and described a preferred embodiment of my invention, this has vbeen done by way of example and not by way of last part only of the closing movement of said throttle.

2. In a carburetor, a throttle and means including a liquid containing dashpot to retard the last part only of the closing movement of said throttle.

3. Supplemental' controlling means for the throttle controlling apparatus of a hydrocarbonv internal combustion engine comprising a dashpot arranged to engage said throttle controlling ap- I paratus during the closing movement of the latter, but only prior to the completion of Said movement, and to thereby slightly delay the completion of said' throttle closing movement.

4. ,Controlling means for the throttle valve of a hydrocarbon internal combustion engine com- 'prising the combination with an oscillating eleelement, during the last stage only of its throttle vond spring tending to move said throttle element in a throttle-closing direction andlwhich is strong# 25 which said dashpot apparatus comprises a closed I casing containing a body of liquid and a piston iitting said casing and movable in said liquid.

8. In internal combustion engine carbureting apparatus, means for conducting combustible mixture to the engine, a valve which decreases the volume of combustible mixture which is supplied to the engine per unit of time when it is moved in one`direction, means for moving the valve in the mentioned direction so as to decrease the volume of combustible mixture which is supplied to the engine per unit of time, and retarding 'mechanism which is so constructed and arranged that it is ineffective during the earlier stages of movement of the valve in the the volume of combustible mixture which is sup-A plied to the engine per unit of time when it is moved in one direction, means for moving the valve in the mentioned direction so as to decrease the volume of combustible mixture which is supplied t'o the engine per unit of time, and retarding mechanism which is so constructed and arranged that it is ineffective during the earlier stages of the movement of the valve in the mentioned direction but resists further movement of the valve in the mentioned direction so as to retard the rate of decrease of the volume of com-I bustible mixture which is supplied .to the engine per unit of time after the valve has been moved to a. predetermined position in the mentioned direction.

11. In internal combustion engine carbureting apparatus, means for conducting combustiblel mixture to the engine, a valve which decreases the Volume of combustible mixture which is supplied to the engine per unit of time when it is moved in one direction, means for moving the valve in the mentioned direction so as to decrease ,the volume of combustible mixture which is supplied to the engine per unit of time, and retarding mechanism which is so constructed and arranged that it is out of engagement with the valve during the earlier stages of the movement of the valve in the mentioned direction but is engaged by the valve or a part operatively associated therewith after the valve has been moved to a predetermined position in the mentioned direction so that it resists further movement of the valve in the mentioned direction and retards the rate of decrease of the volume of combustible mixture which is supplied to the engine per unit of time after the valve has been moved to a. lpredetermined position in the mentioned direction.

12. In a carburetor, a mixture passage, a valve in the mixture passage to control the discharge of combustible mixture therefrom, means for moving the valve, and means adapted to resist movement of the valve only when it is moving toward closed position and has reached a predetermined position between fully opened position and fully closed position, the last mentioned means including a dashpot mechanism which is operatively connected to the valve only when the valve is in a predetermined position.

13. In a carburetor, a mixture4 passage, a valve in the mixture passage to control the discharge of combustible mixture therefrom, means for moving the valve, and means adapted to resist movement of the valve only when it is moving toward closed position and has reached a predetermined position between fully opened position and fully closed position, the last mentioned means including a cylinder, and a piston in the cylinder adapted to be operatively connected to the valve only A when the valve is in a predetermined position and then to resist movement of the valve only when it is moving toward closedl position.

14. In a carburetor, a mixture passage, a. valve in the mixture-passage to control the discharge of combustible mixture therefrom, means for moving the valve toward closed position, andmeans including a dashpot mechanism for retarding the rate of closing of the valve during the latter part only of its closing movement.

15. In a carburetor, a mixture passage, a valve in the mixture passage to control the discharge of combustible mixture therefrom, means yfor moving the valve toward closed position, and means for retarding the rate of closing of the valve during the latter part only of its closing movement, the last mentioned means including a dashpot mechanism to which the valve is operati'vely connected during the latter part only of its closing movement. LESTER E. PERRINE. 

